Kepler-28b
Exoplanet | List of exoplanets | |
---|---|---|
Parent star | ||
Star | Kepler-28 | |
Constellation | Cygnus | |
Right ascension | (α) | 19h 28m 32.887s |
Declination | (δ) | +42° 25′ 45.91″ |
Apparent magnitude | (mV) | 15.5 |
Spectral type | M0V[1] | |
Mass | (m) | 0.75[1] M☉ |
Radius | (r) | 0.70[1] R☉ |
Temperature | (T) | 4590[1] K |
Physical characteristics | ||
Radius | (r) | +0.04 −0.17 2.41[1] R⊕ |
Orbital elements | ||
Semi-major axis | (a) | 0.05375[1] AU |
Orbital period | (P) | 5.91227[1] d |
Discovery information | ||
Discovery date | 25 January 2012 | |
Discoverer(s) | Jason Steffen et al. | |
Discovery method | Transit | |
Discovery site | Kepler Space Observatory | |
Discovery status | Published | |
Database references | ||
Extrasolar Planets Encyclopaedia | data | |
SIMBAD | data | |
Exoplanet Archive | data | |
Open Exoplanet Catalogue | data |
Kepler-28b is an extrasolar planet orbiting the star Kepler-28. It is a transiting planet that is smaller than Jupiter that orbits very closely to Kepler-28.
Host star
Kepler-28 is the host star of Kepler-28b, and is alternatively known as KOI-870 and KIC 6949607. The star is smaller, less massive, and cooler than the Sun, with (respectively) a radius 0.7 times of the Sun; a mass 0.75 times of the Sun; and an effective temperature of 4590 K.[2] The star has a high metallicity with relation to the Sun, as it has a metallicity of [M/H] = 0.34. With an apparent magnitude of 15.05, Kepler-28 is effectively invisible to the naked eye from Earth.[3]
Characteristics
Kepler-28b is a gas giant that, at its maximum could be 1.51 times the mass of Jupiter. However, at 0.32 Jupiter radii, Kepler-28b is far smaller than Jupiter. The planet orbits at a distance of 0.062 AU, which corresponds roughly to 6% of the average distance that separates the Sun and Earth, and completes each orbit every 5.9123 days.[2] The planet, which transits its host star, completely passes across the face of Kepler-28 in 2.77 hours.[3] The ratio of its orbital period with that of Kepler-28c is 1.52.[4]
References
- 1 2 3 4 5 6 7 "Kepler-28 b". NASA Exoplanet Archive. Retrieved 23 January 2017.
- 1 2 "Star: Kepler-28". Extrasolar Planets Encyclopaedia. 2012. Archived from the original on 26 April 2012. Retrieved 22 June 2012.
- 1 2 "Kepler Table of Discoveries". Kepler Mission. Ames Research Center, NASA. 2012. Retrieved 22 June 2012.
- ↑ Steffen, J.; Fabrycky, D. (2012). "Transit Timing Observations from Kepler: III. Confirmation of 4 Multiple Planet Systems by a Fourier-Domain Study of Anti-correlated Transit Timing Variations". Monthly Notices of the Royal Astronomical Society. 421: 2342. Bibcode:2012MNRAS.421.2342S. arXiv:1201.5412v1 . doi:10.1111/j.1365-2966.2012.20467.x.